@Article{KumarNuneYada:2019:TeWaDa,
author = "Kumar, Suresh and Nunes, Rafael da Costa and Yadav, Santosh
Kumar",
affiliation = "{BITS Pilani} and {Instituto Nacional de Pesquisas Espaciais
(INPE)} and {BITS Pilani}",
title = "Testing the warmness of dark matter",
journal = "Monthly Notices of the Royal Astronomical Society",
year = "2019",
volume = "490",
number = "1",
pages = "1406--1414",
month = "Nov.",
keywords = "cosmological parameters, dark energy, dark matter, cosmology:
observations.",
abstract = "Dark matter (DM) as a pressureless perfect fluid provides a good
fit of the standard Lambda cold dark matter (Lambda CDM) model to
the astrophysical and cosmological data. In this paper, we
investigate two extended properties of DM: a possible time
dependence of the equation of state of DM via
Chevallier-Polarski-Linder parametrization, w(dm) = w(dm0) +
w(dm1)(1 - a), and the constant non-null sound speed (c) over cap
(2)(s,dm). We analyse these DM properties on top of the base
Lambda CDM model by using the data from Planck cosmic microwave
background (CMB) temperature and polarization anisotropy, baryonic
acoustic oscillations (BAOs), and the local value of the Hubble
constant from the Hubble Space Telescope (HST). We find new and
robust constraints on the extended free parameters of DM. The most
tight constraints are imposed by CMB+BAO data, where the three
parameters w(dm0), w(dm1), and (c) over cap (2)(s,dm) are,
respectively, constrained to be less than 1.43 x 10(-3), 1.44 x
10(-3), and 1.79 x 10(-6) at 95 per cent CL. All the extended
parameters of DM show consistency with zero at 95 per cent CL,
indicating no evidence beyond the CDM paradigm. We notice that the
extended properties of DM significantly affect several parameters
of the base Lambda CDM model. In particular, in all the analyses
performed here, we find significantly larger mean values of H-0
and lower mean values of sigma(8) in comparison to the base Lambda
CDM model. Thus, the well-known H-0 and sigma(8) tensions might be
reconciled in the presence of extended DM parameters within the
Lambda CDM framework. Also, we estimate the warmness of DM
particles as well as its mass scale, and find a lower bound:
similar to 500 eV from our analyses.",
doi = "10.1093/mnras/stz2676",
url = "http://dx.doi.org/10.1093/mnras/stz2676",
issn = "0035-8711 and 1365-2966",
language = "en",
targetfile = "kumar_testing.pdf",
urlaccessdate = "17 abr. 2021"
}